CPC G02B 13/0045 (2013.01) [G02B 9/64 (2013.01)] | 13 Claims |
1. An optical imaging system, comprising:
a first lens, a second lens, a third lens, a fourth lens having negative refractive power, a fifth lens havmg negative refractive power, a sixth lens, and a seventh lens, sequentially arranged from an object side,
wherein f3/f>1.5, where a focal length of the third lens is f3, and an overall focal length of the optical imaging system is f,
the sixth lens has a concave image-side surface in a paraxial region,
TTL/(2*Img HT)<0.7, where a distance on an optical axis from an object-side surface of the first lens to an imaging plane of an image sensor is TTL, and half of a diagonal length of the imaging plane of the image sensor is Img HT,
Fno<1.9, where an F-number of the optical imaging system is Fno, and
|f4/f|>3.0 and f6/f>0, where a focal length of the fourth lens is f4, a focal length of the sixth lens is f6, and an overall focal length of the optical imaging system is f.
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